tools: remove fixer for non-ascii-character ESLint custom rule

The fixer for non-ascii-character does not typidally do the right thing.
It removes the entire node, not the offending character. I discovered
this when it removed the entire contents of a file and I wasn't sure
which auto-fix rule was doing it.

This commit adds a minimal test for the rule. The tests require that
auto-fix results be supplied, so if someone wants to re-add auto-fixing
to the rule, we'll have tests that it does the right thing.

PR-URL: https://github.com/nodejs/node/pull/38413


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>